Jerry, I hope you don't get mad at me for this!! I'm not trying to rotate the planet with this little roadster. The engine is a '78 200 ci V6. Long story why, but it's the one I'm going to run. Pulleys are 1:1, though I originally wanted underdrive. Short answer? More for the nostalgia look than anything else. There is a reason they went from chain drive, to V-belt, to Gilmer!! Although that Potvin guy did things a little different.